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Interface Signals
Table B-6
Cascade Port and Station Clock Signal Assignments – SpectraComm Shelf
with 50-pin Connector Back Panel (Connectors J20 – J22)
Signal
Cascade Send Data (Ring)
Cascade Send Data (Tip)
Station Clock A
Cascade Receive Data (Ring)
Cascade Receive Data (Tip)
Station Clock B
Signal
Cascade Send Data (Ring)
Cascade Send Data (Tip)
Station Clock A
Cascade Receive Data (Ring)
Cascade Receive Data (Tip)
Station Clock B
Signal
Cascade Send Data (Ring)
Cascade Send Data (Tip)
Station Clock A
Cascade Receive Data (Ring)
Cascade Receive Data (Tip)
Station Clock B
Signal
Cascade Send Data (Ring)
Cascade Send Data (Tip)
Station Clock A
Cascade Receive Data (Ring)
Cascade Receive Data (Tip)
Station Clock B
B-4
(Slot 1) J20
1
26
2
3
28
27
(Slot 5) J20
17
42
18
19
44
43
(Slot 9) J21
9
34
10
11
36
35
(Slot 13) J22
1
26
2
3
28
27
SpectraComm 553 Fractional T1 DSU
Installation and Operation Manual
(Slot 2) J20
(Slot 3) J20
5
9
30
34
6
10
7
11
32
36
31
35
(Slot 6) J20
(Slot 7)J21
21
1
46
26
22
2
23
3
48
28
47
27
(Slot 10) J21
(Slot 11) J21
13
17
38
42
14
18
15
19
40
44
39
43
(Slot 14) J22
(Slot 15) J22
5
9
30
34
6
10
7
11
32
36
31
35
(Slot 4) J20
13
38
14
15
40
39
(Slot 8) J21
5
30
6
7
32
31
(Slot 12) J21
21
46
22
23
48
47
(Slot 16) J22
13
38
14
15
40
39
076R155-000
Issue 7
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